Triimide-Functionalized n-Type Polymer Semiconductors Enabling All-Polymer Solar Cells with Power Conversion Efficiencies Approaching 9%

Yingfeng Wang, Zhenglong Yan, Mohammad Afsar Uddin, Xin Zhou, Kun Yang, Yumin Tang, Bin Liu, Yongqiang Shi, Huiliang Sun, Aiying Deng, Junfeng Dai, Han Young Woo, Xugang Guo

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14 Citations (Scopus)

Abstract

Two triimide-functionalized n-type acceptor polymers are designed and synthesized, which show narrower bandgap, lower-lying frontier molecular orbital energy levels, and improved film morphology than the diimide-functionalized analogue polymers. When blended with a p-type donor polymer semiconductor PTB7-Th, an outstanding power conversion efficiency of 8.98% with a remarkable open-circuit voltage of 1.03 V is attained. This efficiency is among the highest values in all-polymer solar cells (all-PSCs) reported till today, surpassing that (6.85%) of the diimide-functionalized analogue polymers by a big margin and even higher than that (8.69%) of the fullerene-based solar cells. The results demonstrate that the triimide-functionalized f-BTI3 is an excellent building block for developing n-type polymer semiconductors, and the polymer f-BTI3-T is among the best-performing n-type polymers for applications in all-PSCs. The structure–property correlations of these imide-functionalized polymer semiconductors offer important guides for developing high-performance n-type polymer semiconductors.

Original languageEnglish
Article number1900107
JournalSolar RRL
Volume3
Issue number7
DOIs
Publication statusPublished - 2019 Jul 1

Keywords

  • all-polymer solar cells
  • imide-functionalized polymers
  • n-type polymer semiconductors
  • organic electronics
  • structure–property relationships

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Energy Engineering and Power Technology
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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  • Cite this

    Wang, Y., Yan, Z., Uddin, M. A., Zhou, X., Yang, K., Tang, Y., Liu, B., Shi, Y., Sun, H., Deng, A., Dai, J., Woo, H. Y., & Guo, X. (2019). Triimide-Functionalized n-Type Polymer Semiconductors Enabling All-Polymer Solar Cells with Power Conversion Efficiencies Approaching 9%. Solar RRL, 3(7), [1900107]. https://doi.org/10.1002/solr.201900107